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Last update: 2014-09-22T01:58:19 (UT)
  | now: 2014-09-22T06:26:54 (UT) muc01 QC pipeline: fors2-4.9.24 (installed 2014-03-11)
same group: b_HIGH v_HIGH R_SPEC I_BESS
General news:
FORS2 news:  
Report news:
DATE*: [?] 2014-09-15
report | NLT
2014-09-16
report | NLT
2014-09-17
report | NLT
2014-09-18
report | NLT
2014-09-19
report | NLT
2014-09-20
report | NLT
2014-09-21
report | NLT
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  last OPSLOG data:
2014-09-21*

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*Date on this monitor changes at 21:00 UT
Print: Information and research:
- png file - advanced studies: QC1 browser | QC1 plotter
for the frame zeropoints: QC1 browser | QC1 plotter
Plot
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Symb
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Source
*
OPS?
**
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 QC1DB yes (7) none   mag none  35 zeropoint this | last_yr | all Chip 1: night zeropoint (HC plot: 28 days delay; available since 2012-06)
1 QC1DB yes (7) none   mag none  4 zeropoint this | last_yr | all same (for stable nights; available since 2012-06)
1 oQC1DB yes (7) MEDIAN 28.23 mag OFF± 0.25 106 zp_frame this | last_yr | all Frame zeropoint (from single measurement; more than 1 star)
1 QC1DB yes (7) none   mag none  13 zp_frame this | last_yr | all Frame zeropoint, for stable night
2 oQC1DB yes (7) MEDIAN 0.004989 mag VAL0,0.07 106 sig_zp_frame this | last_yr | all Statistical error of frame zeropoint

3 QC1DB yes (7) none   mag none  35 zeropoint this | last_yr | all Chip 2: night zeropoint (HC plot: 28 days delay; available since 2012-06)
3 QC1DB yes (7) none   mag none  4 zeropoint this | last_yr | all same (for stable nights; available since 2012-06)
3 oQC1DB yes (7) MEDIAN 28.22 mag OFF± 0.25 111 zp_frame this | last_yr | all Frame zeropoint (from single measurement; more than 1 star)
3 QC1DB yes (7) none   mag none  13 zp_frame this | last_yr | all Frame zeropoint, for stable night
4 oQC1DB yes (7) MEDIAN 0.005565 mag VAL0,0.07 111 sig_zp_frame this | last_yr | all Statistical error of frame zeropoint
*Data sources: QC1DB: QC1 database; LOCAL: local text file | **OPS: OPSLOG data are included
Plot 1
scores: not implemented
data source:fors2_photometry
(QC1 database)
dataset:
(numbers below apply to this dataset)
zeropoint
average:none
thresholds:none
N_data plotted:35
[click on plot for closeup]
Plot 3
scores: not implemented
data source:fors2_photometry
(QC1 database)
dataset:
(numbers below apply to this dataset)
zeropoint
average:none
thresholds:none
N_data plotted:35
[click on plot for closeup]
Plot 2
scores: not implemented
data source:fors2_zp_frame
(QC1 database)
dataset:sig_zp_frameo
median:0.004989mag
fixed thresholds:0...0.07mag
N_data plotted:106
[click on plot for closeup]
Plot 4
scores: not implemented
data source:fors2_zp_frame
(QC1 database)
dataset:sig_zp_frameo
median:0.005565mag
fixed thresholds:0...0.07mag
N_data plotted:111
[click on plot for closeup]
This plot

This plot displays two kinds of photometric zeropoints: the frame zeropoints (calculated by the pipeline recipe fors_zeropoint) and the instrumental zeropoints (calculated by fors_photometry). The frame zeropoints are based on individual standard star exposures, while the instrumental zeropoints take into account all available standard star exposures of a certain number of nights and refer to that time range. The standard star frames are observed for both CHIP1 and CHIP2. All zeropoints are based on flux in e-/sec.

The frame zeropoints are calculated assuming a standard extinction coefficient, which may not be correct for an individual night. The instrumental zeropoints are based on all extracted sources in a given time interval around the reference night (plus/minus 14 days). The linear equations are solved assuming a constant instrumental zeropoint and a constant extinction coefficient per night. The solutions are quite sensitive to this assumption of a constant extinction value throughout each night. Only photometrically stable input nights are accepted for these values.

These zeropoints are based on the FORS2 calibration plan as part of the FORS2 absolute photometry project. It foresees the acquisition of an initial pair of standard stars for "promising" nights, and the follow-up standard star fields for actually photometric nights.

The initial pair is a set of standard star fields taken at the begin of the night, at two airmasses separated by at least 0.4. If the corresponding extinction values differ by no more than 0.05 in all filters (for b_HIGH: 0.06), the night is called at least 'Sb' ("stable at begin"). If there are follow-up photometric data in the latter course of the same night, again with stable extinction, the night is called 'S'. If there are such data but the extinction variation was larger than these thresholds, the flag becomes 'N' (not stable). In all other cases the photometric quality of the night is 'U' (unknown). For the instrumental zeropoints, only 'S' and 'Sb' nights are used.

Due to the selection window and the data processing schedule, the nightly zeropoints become available typically after a month.

For the nightly extinction values derived from the nightly zeropoints click on 'extinction'. The pipeline recipe fors_photometry is operational since 2012-06, hence the nightly zeropoints are available from the same date on. All HISTORY plots earlier than 2012-06 do not have night zeropoints.

Major mirror interventions (recoating) are marked by a red vertical bar.

More information can be found on the plot tutorial page.  


General information

Click on any of the plots to see a close-up version.

If applicable, the latest values from Paranal ops logs are plotted as blue dots. More information about those values, including a download option, is available in the OPS column.

The latest date is indicated on top of the plot, data points belonging to that date are specially marked.

If configured,

  • statistical averages are indicated by a solid line, and thresholds by broken lines
  • outliers are marked by a red asterisk. They are defined as data points outside the threshold lines
  • "aliens" (= data points outside the plot Y limits) are marked by a red arrow ( or )
  • you can download the data for each parameter set if the 'Data downloads' link shows up